New York, The Engineering & building record press
New York, Providence and Boston Railroad Company
TG25 N49 B6
In public domain
Boller, Alfred Pancoast, "New York, Providence and Boston Railroad. Report to the General Manager, Upon the Construction of the Thames River Bridge and Approaches, at New London, Conn., by Alfred P. Boller, Chief Engineer" (1890). Special Collections Publications (Miscellaneous). Paper 16.